JP2819838B2 - Video camera equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video camera apparatus for performing a swing correction.

[0002]

2. Description of the Related Art As a conventional fluctuation correcting device, for example, a device disclosed in Japanese Patent Application Laid-Open No. Sho 60-14330 and a technical report of the Institute of Television Engineers of Japan, Vol. 11 No. 3 pp. 43
48, PPOE '87 -12 (May, 1987). These devices are composed of a motion detecting unit such as a swing and a motion compensating unit for compensating motion using an output signal of the device. And an electric circuit for detecting
There are two types: a configuration for mechanically correcting motion and a configuration using an image processing circuit for directly processing and correcting a video signal.

On the other hand, in recent years, video camera devices have become increasingly smaller and lighter in the field of consumer use and the like, and as a swing correction device, a configuration using an image processing circuit or the like that does not require a mechanical configuration is expected to be promising. .

A conventional example of a video camera device in which the motion correcting section of the swing correction device is constituted by an image processing circuit or the like will be described with reference to FIGS.

FIG. 9 is a block diagram of a video camera apparatus for performing a conventional swing correction. 9, reference numeral 901 denotes a taking lens; 902, an aperture device; 903, an aperture drive circuit; 904, an image sensor; 905, an image sensor drive circuit;
Reference numeral 06 denotes an image sensor drive control circuit for controlling the image sensor drive circuit 905; 907, a synchronization signal generation circuit; 908, a signal processing circuit for processing a signal output from the image sensor 904 to obtain a predetermined signal; A signal detection circuit for detecting a signal output from the circuit 908 to obtain an aperture control signal and outputting the signal to the aperture drive circuit 903; 910, a motion detection device; 911, a mode selection circuit for selecting a normal mode and a motion correction mode; When a motion compensation mode is selected by the mode selection circuit 911, an image motion compensation control signal 912 is generated in response to a motion detection signal output from the motion detection device 910, and a memory circuit 914 and a 915 are provided.
These signals are output to the interpolation calculation circuit of FIG. 7 and are controlled so as to perform motion compensation. When the normal mode is selected by the mode selection circuit 911, the motion compensation is not performed.
A motion correction control circuit 914 for outputting a signal for controlling the memory circuit 14 and the interpolation calculation circuit 915, and a memory circuit 91 for A / D converting the output signal of the signal processing circuit 908
4, an A / D converter 916 is provided for the interpolation operation circuit 91.
5 is a D / A converter for D / A converting the output signal of FIG. Further, the image pickup device 904, the image pickup device drive circuit 905, and the image pickup device drive control circuit 906 have an electronic shutter function (a function of switching the time of photoelectric conversion and charge accumulation of the image pickup device), and the motion correction mode is selected by the mode selection circuit 911. When the operation is performed, the image sensor drive control circuit 90
Reference numeral 6 controls the image sensor driving circuit 905 to switch the electronic shutter speed (time for photoelectric conversion and charge accumulation of the image sensor) to a higher speed side.

A description will now be given of the processing of motion detection and motion correction in the video camera apparatus having the above components. The motion detection device 910 uses two angular velocity sensors or the like to detect the vertical and horizontal motions of the video camera, integrates the output of each of them for a certain time, and within the time, outputs the vertical and horizontal motions. Then, the amount and direction of the motion on the image (hereinafter, referred to as a motion vector) are calculated from the information on the angle of view, and output as a motion detection signal. As a motion detecting device, there is a method of directly obtaining a motion vector from an image signal as described above in addition to the conventional example. That is, this method is to check a correlation between a previous image and a current image using a memory or the like and calculate a motion vector. The motion of the image is corrected based on the motion detection signal (motion vector) thus obtained. Normally, these processes are performed for each field or frame. In the following description, the process for each field will be described as an example.

The motion of the image is corrected by using the memory 914 and the interpolation arithmetic circuit 915 to cut out a part of the effective area of the original video signal and to output an enlarged video signal. This is performed by moving an area to be cut by an amount corresponding to the movement of the original image, that is, a motion vector. The processing of the motion correction will be described with reference to FIG. In the figure, the area in the vertical direction (V ₀ ) × the horizontal direction (H ₀ ) indicates the effective area of the video signal output from the signal processing circuit, and is the area (I), ie, (V ₁ × H ₁ ) and the area (II), ie, (V ₂ × H ₂ ) indicates the effective area of the video signal after motion compensation. Now, it is assumed that the image of the area (V ₀ × H ₀ ) has moved by one arrow during one field due to the swing of the video camera device. The size and direction of the arrow are detected as a motion vector by the motion detection device 910 and sent to the motion correction control circuit 912. The motion correction control circuit 912
It has a function of controlling the memory 914 and the interpolation arithmetic circuit 915 to enlarge a part of the effective area of the original video signal, and further, by controlling the memory read address, has a function of making the enlarged area variable. , The region to be enlarged based on the obtained motion vector is defined as region (I), that is, (V ₁
× H ₁ ), after one field, it switches to region (II), that is, (V ₂ × H ₂ ). In this way, a motion-compensated video signal is obtained at the output of the interpolation operation circuit 915.
In the figure, S, S ₁ , and S ₂ indicate the start points of the effective areas of the respective video signals, and the output timing is always at the same position with respect to the synchronization signal.

The motion compensation control circuit 912 is composed of a memory write address generation circuit, a memory read address generation circuit based on a motion vector, and the like. Of these, the configuration of the read address generation circuit is shown in FIG. It will be described using FIG. In the figure, reference numeral 1101 denotes an H start address generation circuit that generates a horizontal start address based on data of a horizontal component of a motion vector; 1102, an H address pitch generation circuit that generates a horizontal address pitch based on an enlargement factor; Is a V start address generation circuit for generating a vertical start address based on data of a vertical component of a motion vector, 1104 is a V address pitch generation circuit for generating a vertical address pitch based on an enlargement factor, 1105, 1106, 1107 and 1108 are latch circuits, 1109 and 1112 are selection circuits, 1110 and 1
113 is a latch circuit, and 1111 and 1114 are adders. The selection circuit 1109 outputs H at the timing of the H synchronization pulse.
The start address signal is selected, and at other timings, the output signal of the adder 1111 is selected. The latch circuit 1110 latches the output signal of the selection circuit 1109 every system clock. The latch output signal is added to adder 111
The value 1 is added to the H address pitch signal. Therefore, the output of the latch 1110 is a signal obtained by adding one pitch to the H start address every clock.
The integer part of the H read address signal thus obtained is output as a read address signal of the memory 914, and the decimal part is output as a weight coefficient of the interpolation arithmetic circuit 915.

Similarly, in the vertical direction, a V read address signal obtained by adding one pitch to the V start address for each H synchronization pulse is obtained, of which an integer part is used as a read address signal for the memory 914 and a decimal part is used. It is output as a weight coefficient of the interpolation calculation circuit 915.

Next, the processing in the interpolation operation circuit 915 will be described with reference to FIG. The circle in the figure indicates the memory circuit 9
14 shows data of a corner sampling point of a video signal read out from FIG. On the other hand, the sampling points required for enlarging the video signal and performing motion compensation do not always match the sampling points of the memory circuit output signal, as indicated by the square marks, and the data is interpolated from the surrounding memory circuit output signal data. It must be calculated. The figure shows a method of obtaining the data of the sampling point Z by linear interpolation from the surrounding four points A, B, C, and D. In the figure, x and y are
This is a weight coefficient obtained from the decimal part of the H and V read address signals described in FIG. That is, the data at the sampling point Z can be obtained by the following equation.

I (z) = (1-x)） {(1-y) ・ I (A) + y ・ I (B)} + x ｛{(1-y) ・ I (C) + y ・ I (D )｝ (1) where I (Z) and I (A) to I (D) indicate data at sampling points Z and A to D.

FIG. 13 is a block diagram showing a configuration of an interpolation operation circuit 915 for performing the operation of the equation (1). 130 in the figure
1,1302,1303,1304,1307,130
8 is a multiplier, and 1305, 1306, and 1309 are adders.

The reason why the electronic shutter speed of the image sensor is switched to the high speed side when the motion correction mode is selected will be described with reference to FIG. When the image moves from the n-th field to the (n + 1) -th field and the (n + 2) -th field as shown in FIG. 7A, the motion within the accumulation time of the image sensor becomes an afterimage. The figure shows a state of an afterimage when the accumulation time of the image sensor is one field. On the other hand, FIG. 8B shows the result when the motion correction processing is performed by the above-described method. That is, the motion between the fields is corrected, but the afterimage of the field remains. The afterimage of the field is very conspicuous because the image is unnatural after the motion is corrected, and flickers when the amount or direction of the image motion between fields changes, thereby deteriorating the image quality. Therefore, when performing motion correction, the electronic shutter is switched to the high-speed side as shown in FIG. 9C to reduce the field afterimage, so that the effect of the field afterimage as shown in FIG. I try to be smaller.

[0014]

The effect of the residual image of the image sensor on the image and the necessity of interlocking with the high-speed electronic shutter when the motion correction is performed are as described in the description of the conventional example. Normally, the speed of the electronic shutter needs to be considerably high, for example, 1/250 sec. To 1/500 sec., In order to reduce the influence of the accumulated residual image on the image to a visually acceptable level. However, in the configuration shown in the conventional example, since the speed of the electronic shutter in the motion compensation mode is always constant, if the electronic shutter is set at a high speed in order to sufficiently obtain the effect, the subject for dark illumination conditions is not obtained. The sensitivity of the video camera is remarkably reduced, and the S / N is deteriorated. Also, if the speed of the electronic shutter is set to a low value, it is not possible to reduce the effect of the accumulated afterimage on the image to a visually acceptable level even when the subject is sufficiently bright. Further, under illumination of a fluorescent lamp or the like that repeats blinking at a frequency different from the field frequency, image flicker is significantly generated depending on the speed of the electronic shutter. It is necessary to set so that image flicker does not occur.

The present invention has been made to solve the above-mentioned problem, and in the motion compensation mode, the electronic shutter is interlocked.
It is an object of the present invention to provide a video camera device capable of automatically and always obtaining an optimal electronic shutter speed.

[0016]

In order to achieve the above object, the present invention provides an optical unit for optically forming an image of light from a subject, and a diaphragm device in the optical unit capable of adjusting the amount of incident light. An aperture detection device that outputs an aperture detection signal, an image sensor, an image sensor drive circuit having an electronic shutter function, an exposure control circuit that controls one or both of the aperture device and the image sensor drive circuit, and a motion detector. , A motion correction control circuit, an image motion correction unit, a selection circuit for a normal mode and a motion correction mode, and a flicker detection device.

[0017]

According to the present invention, in the above construction, in the motion compensation mode, the image motion compensation circuit compensates for the motion of the image due to the swing of the video camera device, and at the same time, the exposure control circuit detects the aperture detected by the aperture detection device. A signal is used to process the output image signal of the image sensor so that the electronic shutter speed is equal to or higher than a predetermined speed as long as the aperture is not open or close to open. If the level of the signal to be obtained does not reach a predetermined value, one or both of the aperture device and the image sensor driving circuit are controlled so that the electronic shutter speed is reduced as necessary while the aperture is open or close to open. The optimal electronic shutter speed is always obtained automatically in conjunction with the correction.

Further, when flicker is detected,
The exposure control circuit controls one or both of the aperture device and the image sensor driving circuit such that the electronic shutter speed shifts to the second predetermined speed preferentially, thereby preventing image flicker from occurring.

[0019]

FIG. 1 is a block diagram of a video camera apparatus showing a first embodiment of the present invention. In FIG. 1, 101 is a taking lens, 102 is an aperture device, 103 is an aperture drive circuit, 104 is an image sensor, 105 is an image sensor drive circuit, 106 is an image sensor drive control circuit that controls the image sensor drive circuit 105, 107 Is a synchronization signal generation circuit, 108 is a signal processing circuit that processes a signal output from the image sensor 104 to obtain a predetermined signal, 109 is a signal detection circuit that detects a signal output from the signal processing circuit 108, and 110 is a motion detection circuit. A detection device; 111, a mode selection circuit for selecting a normal mode and a motion compensation mode; 112, a mode selection circuit 11
When the motion compensation mode is selected by 1, an image motion compensation control signal is generated in response to a motion detection signal output from the motion estimation device 110, and output to a memory circuit 114 and an interpolation calculation circuit 115 to perform motion compensation. And a signal for controlling the memory circuit 114 and the interpolation arithmetic circuit 115 so as not to perform the motion correction when the normal mode is selected by the mode selection circuit 111. A circuit 113, an A / D converter for A / D converting an output signal of the signal processing circuit 108 and outputting it to the memory circuit 114; 116, a D / A converter for D / A converting the output signal of the interpolation operation circuit 115 ,
Reference numeral 117 denotes an aperture detection device that detects the state of the aperture of the aperture device 102 and outputs an aperture detection signal, and 118 denotes a signal detection circuit 1
An exposure control circuit that generates an exposure control signal in response to the output signal of the aperture control signal 09, the output aperture detection signal of the aperture detection device 117 and the output signal of the mode selection circuit 111, and outputs the exposure control signal to the aperture drive circuit 103 and the image sensor drive control circuit 106. is there.

With respect to this embodiment of the above components, the relationship and operation of each component will be described below.

The motion detection and the motion correction have the same functions as those of the conventional example, and the description of the operation is omitted.

The image pickup device 104 is a CCD having a vertical drain structure that discards unnecessary charges generated at the time of an electronic shutter on a base.
And a continuous variable speed shutter of 1/60 to 1/10000 second is made possible by flowing unnecessary electric charge to the substrate every one horizontal scanning period. FIG. 2 shows the timing of the output pulse of the image sensor drive control circuit 106 during the continuous variable speed shutter operation. That is, a charge sweeping pulse is output during the H-BLK period, and unnecessary charges accumulated in the CCD are swept out based on the charge. By changing the number of sweeping pulses, the accumulation time of A in the figure is controlled to enable a continuous variable speed shutter. Therefore, exposure can be controlled by controlling the electronic shutter speed.

When the normal mode is selected by the mode selection circuit 111, the exposure control circuit 118 of FIG. 1 controls only the aperture driving circuit 103 as in the conventional example, and the level of the output signal of the signal detection circuit is reduced. Exposure control is performed so as to be constant. When the motion correction mode is selected by the mode selection circuit 111, the aperture driving circuit 1
03 and the image sensor drive control circuit 106 to perform exposure control. FIG. 3 shows how the exposure is controlled at this time.
In the figure, A and A 'indicate the control of the aperture device, B and B' indicate the control of the electronic shutter speed, the broken line indicates the control in the normal mode, and the solid line indicates the control in the motion compensation mode. That is, in the normal mode, the electronic shutter speed is normal (N
The exposure control is performed by controlling only the aperture device while the aperture is fixed at 1/60 second in the TSC system. In the motion compensation mode, the aperture detection signal output from the aperture detection device is monitored, and the aperture device is opened. Unless it is necessary, the electronic shutter speed is fixed at a predetermined speed of 1/500 second to control only the aperture device, and the level of the output signal of the signal detection circuit does not reach the predetermined value even when the aperture device is opened. In this case, exposure control is performed by controlling the electronic shutter speed to be as slow as necessary while keeping the aperture device open.

As described above, in this embodiment, the electronic shutter speed is increased for a bright object to sufficiently suppress the influence of accumulated afterimages in the field of the CCD. CC without lowering sensitivity
This makes it possible to suppress the influence of the accumulated afterimage in the field of D to the maximum.

FIG. 4 is a block diagram of a video camera device showing a second embodiment of the present invention. In the figure, 401 is a taking lens, 402 is an aperture device, 403 is an aperture drive circuit,
404 is an image sensor, 405 is an image sensor driver circuit, 406
Denotes an image sensor drive control circuit for controlling the image sensor drive circuit 405, 407 denotes a synchronization signal generation circuit, and 408 denotes an image sensor 4
A signal processing circuit for processing a signal output from the signal processor 04 to obtain a predetermined signal, a signal detection circuit 409 for detecting a signal output from the signal processing circuit 408, a motion detection device 410, and a normal mode and motion correction 411 A mode selection circuit 412 for selecting a mode receives a motion detection signal output from the motion detection device 410 and generates an image motion correction control signal when the motion correction mode is selected by the mode selection circuit 411. This is output to the drive control circuit 406 and controlled so as to perform motion correction. When the normal mode is selected by the mode selection circuit 411, the image pickup device drive control circuit 4 is controlled not to perform motion correction.
41, a motion compensation control circuit that outputs a signal for controlling 06
Reference numeral 7 denotes an aperture detection device that detects the state of the aperture of the aperture device 402 and outputs an aperture detection signal, and 418 denotes a signal detection circuit 409.
An exposure control circuit generates an exposure control signal in response to the output signal of the aperture detection device 417 and the output signal of the aperture detection device 417 and the output signal of the mode selection circuit 411, and outputs the exposure control signal to the aperture drive circuit 403 and the image sensor drive control circuit 406. .

With respect to this embodiment of the above components, the relationship and operation of each component will be described below.

This embodiment is an example in which the same exposure control method as that of the first embodiment is applied to a video camera apparatus having a different image motion compensation circuit. That is, in the present embodiment, the image sensor 404, the image sensor drive circuit 405, and the image sensor drive control circuit 406 have the function of the image motion correction circuit. The motion of the image is corrected by scanning a part of the entire photoelectric conversion area of the image sensor as an effective imaging area and outputting a video signal, and moving the original image due to the swing of the video camera device, that is, the motion. This is performed by moving the scanning area by the amount of the vector. The processing of the motion correction will be described with reference to FIG. In the figure, an area in the vertical direction (V ₀ ) × horizontal direction (H ₀ ) indicates the entire photoelectric conversion area of the image sensor. In the normal mode, the area (V ₀ ′ × H ₀ ′) in the figure is scanned as an effective imaging area and a video signal is output. In the figure, a region (I), ie, (V ₁ × H ₁ ) and a region (II), ie, (V ₂ × H ₂ ), represent an effective imaging region in the motion compensation mode. The motion of the image due to the swing of the video camera device is detected as a motion vector by the motion detection device 410 and sent to the motion correction control circuit 412. The motion correction control circuit 412 includes an image sensor drive control circuit 406
Has the function of controlling the effective imaging area
The imaging area scanned based on the obtained motion vector is switched from the area (I), that is, (V ₁ × H ₁ ) to the area (II), ie, (V ₂ × H ₂ ) after one field. In this way, a motion-compensated video signal is obtained at the output of the image sensor. Figure _{S, S ', S 1,} S 2 represents the start point of the effective area of each video signal, the timing of the output is always the same position relative to the synchronization signal.

The image pickup device drive control circuit 406 receives a control signal indicating the position of the image pickup region to be scanned, which is output from the motion correction control circuit 412, and removes unnecessary charges in the vertical and horizontal directions other than the effective image pickup region. A control pulse is generated and output to the image sensor driving circuit so that the signal is transferred at high speed and discarded, and the charge in the effective image pickup area is transferred during a regular period and output as a video signal.

Further, the image sensor drive control circuit 406 also has a continuous variable speed shutter function as described in the first embodiment.

FIG. 6 shows the timing of the output pulse of the image pickup device drive control circuit 406 during the continuous variable speed shutter operation. That is, a charge sweeping pulse is output during the H-BLK period, and unnecessary charges accumulated in the image sensor are swept out based on the unnecessary charge. By changing the number of sweeping pulses, the accumulation time of A in the figure is controlled to enable a continuous variable speed shutter. Therefore, exposure can be controlled by controlling the electronic shutter speed. Unnecessary charges other than those in the effective image pickup area are V-B among these charges placed on the vertical and horizontal transfer stages.
A high-speed shift drive clock is output during the LK and H-BLK periods, and control is performed so that high-speed transfer is performed and discarded.
By changing the number of clocks, the imaging area to be scanned is made variable.

As described above, in this embodiment, similarly to the first embodiment, the effect of the afterimage in the field of the image sensor is sufficiently suppressed by increasing the electronic shutter speed for a bright subject, and the image is dark. This makes it possible to minimize the effect of the afterimage in the field of the image sensor without reducing the sensitivity of the video camera to the subject.

FIG. 7 is a block diagram of a video camera apparatus according to a third embodiment of the present invention. In FIG.
Is a taking lens, 702 is an aperture device, 703 is an aperture drive circuit, 704 is an image sensor, 705 is an image sensor drive circuit, 706 is an image sensor drive control circuit that controls the image sensor drive circuit 705, and 707 is a synchronization signal generation circuit , 708 a signal processing circuit for processing a signal output from the image sensor 704 to obtain a predetermined signal; 709, a signal detection circuit for detecting a signal output from the signal processing circuit 708; 710, a motion detection device; A mode selection circuit 712 for selecting a normal mode and a motion correction mode;
When the motion compensation mode is selected by 1, an image motion compensation control signal is generated in response to a motion detection signal output from the motion estimation device 710, and output to the memory circuit 714 and the interpolation operation circuit 715 to perform motion compensation. And a signal for controlling the memory circuit 714 and the interpolation calculation circuit 715 so as not to perform the motion correction when the normal mode is selected by the mode selection circuit 711. A circuit 713, an A / D converter for A / D converting the output signal of the signal processing circuit 708 and outputting it to the memory circuit 714; 716 a D / A converter for D / A converting the output signal of the interpolation operation circuit 715 ,
Reference numeral 717 denotes an aperture detection device that detects the state of the aperture of the aperture device 702 and outputs an aperture detection signal, and 718 denotes a signal detection circuit 7
An exposure control signal is generated in response to the output signal of the aperture detection circuit 09, the aperture detection signal of the aperture detection device 717, the output signal of the mode selection circuit 711, and the output signal of the flicker detection circuit 719 described later. An exposure control circuit 719 outputs to the drive control circuit 706. A flicker detection circuit 719 detects a flicker of an image due to illumination of a fluorescent lamp or the like from an output signal of the signal processing circuit 708, and outputs a flicker detection signal.

With respect to this embodiment of the above components, the relationship and operation of each component will be described below.

The motion detection and the motion correction have the same functions as in the conventional example, and the description of the operation is omitted. Also,
Regarding the exposure control, when the flicker is not detected by the flicker detection circuit, the same control as in the first embodiment is performed.
When flicker is detected, control is performed such that the electronic shutter speed is preferentially shifted to a predetermined speed. FIG. 8 shows how the exposure is controlled at this time. In the figure, A, A 'and A "control the aperture device, B, B' and B" control the electronic shutter speed, dashed lines control in the normal mode, and dashed lines indicate the motion compensation mode. In addition, the control when flicker is not detected, and the solid line indicates the control when flicker is detected. That is, in the normal mode, the electronic shutter speed is fixed to normal (1/60 second in the NTSC system), exposure control is performed by controlling only the aperture device, and in the motion compensation mode, when flicker is not detected,
The aperture detection signal output from the aperture detection device 717 is monitored, and as long as the aperture device is not opened, the electronic shutter speed is fixed at a predetermined speed of 1/500 second and only the aperture device is controlled. If the level of the output signal of the signal detection circuit does not reach the predetermined value even after opening the aperture, control is performed so that the electronic shutter speed is reduced as necessary while the aperture device is opened, and when flicker is detected. Exposure control is performed so as to preferentially shift to a predetermined speed (for example, 1/100 second in the NTSC system). As described above, in the present embodiment, the electronic shutter is interlocked in the motion compensation mode, the optimal electronic shutter speed is always automatically obtained, and the flicker of the image due to the illumination of the fluorescent light or the like can be prevented. .

In this embodiment, as the image pickup device, CC
Although D was used, it is needless to say that this is not the case. Further, in the second embodiment, the image motion compensation circuit function is shared by both the image pickup device and the image pickup device drive control circuit.

[0036]

As is apparent from the above embodiments, according to the present invention, for a bright object, the electronic shutter speed is increased to sufficiently suppress the influence of the residual image in the field of the image sensor. In addition, it is possible to suppress the influence of the residual image in the field of the imaging device to the maximum without lowering the sensitivity of the video camera even for a dark subject. Further, it is possible to provide a video camera device having a function of preventing image flickering caused by illumination such as a fluorescent lamp even in the motion correction mode.

[Brief description of the drawings]

FIG. 1 is a block diagram of a video camera device according to a first embodiment of the present invention.

FIG. 2 is a timing chart of output pulses of an image sensor drive control circuit during a continuous variable speed shutter operation according to the first embodiment of the present invention.

FIG. 3 is an explanatory diagram of exposure control according to the first embodiment of the present invention.

FIG. 4 is a block diagram of a video camera device according to a second embodiment of the present invention.

FIG. 5 is an explanatory diagram of a motion correction process according to a second embodiment of the present invention.

FIG. 6 is a timing chart of output pulses of an image sensor drive control circuit during a continuous variable speed shutter operation according to a second embodiment of the present invention.

FIG. 7 is a block diagram of a video camera device according to a third embodiment of the present invention.

FIG. 8 is an explanatory diagram of exposure control in a third embodiment of the present invention.

FIG. 9 is a block diagram of a conventional video camera device that performs swing correction.

FIG. 10 is an explanatory diagram of a motion correction process in a conventional example.

FIG. 11 is a block diagram of a conventional memory read address generation circuit.

FIG. 12 is an explanatory diagram of a process of an interpolation operation circuit in a conventional example.

FIG. 13 is a block diagram illustrating a configuration of an interpolation operation circuit.

FIG. 14 is an explanatory diagram of an influence of an accumulated image in a field during motion correction in a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 101 Taken lens 102 Aperture device 103 Aperture drive circuit 104 Image sensor 105 Image sensor drive circuit 106 Image sensor drive control circuit 107 Synchronous signal generation circuit 108 Signal processing circuit 109 Signal detection circuit 110 Motion detection device 111 Mode selection circuit 112 Motion correction control Circuit 113 A / D converter 114 Memory circuit 115 Interpolation operation circuit 117 Aperture detection device 118 Exposure control circuit 719 Flicker detection circuit

Claims (2)

(57) [Claims] 1. An optical unit for optically forming an image of light from a subject, a diaphragm device in the optical unit capable of adjusting an amount of incident light, and a diaphragm detection signal for detecting a diaphragm state of the diaphragm device. An aperture detection device that outputs an image signal, an image sensor that photoelectrically converts an optical image formed by the optical unit to output a video signal, and an electronic shutter speed required to obtain an output video signal of the image sensor. An image sensor driving circuit having an electronic shutter function, and one or both of the diaphragm device and the image sensor driving circuit are controlled so that a level of a signal obtained by processing an output video signal of the image sensor becomes a predetermined value. An exposure control circuit, a motion detection device that detects a motion of the video camera device and outputs a motion detection signal, a motion correction control circuit that receives the motion detection signal and outputs an image motion correction control signal, An image motion compensating means configured to compensate an image motion due to a swing or the like of the video camera device in response to an image motion compensation control signal, and a normal mode and a motion compensation mode selection circuit; In the correction mode, at the same time that the image motion is corrected by the image motion correcting means due to the swing of the video camera device, the exposure control circuit uses the aperture detection signal output from the aperture detection device to open or stop the aperture. The level of the signal obtained by processing the output video signal of the image pickup device is set to a predetermined level so that the electronic shutter speed is equal to or higher than a predetermined speed as long as the aperture is not close to the open state, and even when the aperture is opened or close to the open state. When the aperture value is not reached, the aperture device and the aperture device are set so that the electronic shutter speed is reduced as necessary while the aperture is open or close to open. A video camera apparatus having a configuration for controlling one or both of the image element driving circuit. 2. A video camera device comprising a flicker detection device for detecting flicker caused by illumination of a fluorescent lamp or the like. When flicker is detected, the exposure control circuit preferentially sets the electronic shutter speed to a second predetermined value. The video camera device according to claim 1, wherein the video camera device has a configuration for controlling one or both of the aperture device and the image sensor driving circuit so as to shift to a speed.